Calibratation of 3D Scanners for Quantification of Tooth Wear

K.E. Ahmed, X Ju, C.J Whitters, Stephen Pierce, Charles Norman MacLeod

Research output: Contribution to conferencePaper

Abstract

Objective: To establish a novel testing method capable of calibration and validation of contact and non-contact 3D scanners for accurate quantification of tooth wear in patients.
Method: A stainless steel model (SSM) was fabricated to consist of seven ball-bearings, 10 mm in diameter, embedded in a horseshoe shaped base at varying depths. The coordinates of the SSM were measured using a coordinate measuring machine (CMM) with an accuracy of 2 microns (Mitutoyo Crysta Apex-C CMM 544/ Mitutoyo, Japan) . The SSM was then scanned 3 times using a contact stylus profilometer scanner (incise™/ Renishaw, UK) and a non-contact class II laser scanner (FARO™ V3/ FARO, USA) and stereolithography (STL) images were generated. A surface-matching software (Verisurf™ / Verisurf, USA) was used to compare the scan-generated STL images to the CMM measured coordinates of the SSM's seven ball-bearings.

Result: The 3D contact scanner measurements demonstrated a higher accuracy and precision compared to the non-contact scanner. Mean measurements’ difference between the incise™ and CMM was 2.8 microns with a standard error of 0.2 microns, while the FARO™ demonstrated a mean difference of 82 microns with a standard error of 7.5 microns. However, the incise™ scanning time was twice that for the FARO™.

Conclusion: The novel testing method can be employed to independently calibrate and validate the accuracy and precision of contact and non-contact 3D scanners with the potential use in tooth wear quantification studies that require high accuracy and precision measurements. 3D contact scanners offer more accurate and precise measurements compared to non-contact scanners. On the other hand, contact scanners can be more time-consuming.
Original languageEnglish
Publication statusPublished - Sep 2013
Event46th meeting of the Continental European Division of the International Association for Dental Research organized together with NOF - Florence, Italy
Duration: 4 Sep 20137 Sep 2013

Conference

Conference46th meeting of the Continental European Division of the International Association for Dental Research organized together with NOF
CountryItaly
CityFlorence
Period4/09/137/09/13

Fingerprint

Tooth Wear
Coordinate measuring machines
Stainless Steel
Wear of materials
Stereolithography
Ball bearings
Stainless steel
Calibration
Japan
Testing
Lasers
Software
Scanning

Keywords

  • calibration
  • 3D scanners
  • quantification
  • tooth wear

Cite this

Ahmed, K. E., Ju, X., Whitters, C. J., Pierce, S., & MacLeod, C. N. (2013). Calibratation of 3D Scanners for Quantification of Tooth Wear. Paper presented at 46th meeting of the Continental European Division of the International Association for Dental Research organized together with NOF , Florence, Italy.
Ahmed, K.E. ; Ju, X ; Whitters, C.J ; Pierce, Stephen ; MacLeod, Charles Norman. / Calibratation of 3D Scanners for Quantification of Tooth Wear. Paper presented at 46th meeting of the Continental European Division of the International Association for Dental Research organized together with NOF , Florence, Italy.
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abstract = "Objective: To establish a novel testing method capable of calibration and validation of contact and non-contact 3D scanners for accurate quantification of tooth wear in patients.Method: A stainless steel model (SSM) was fabricated to consist of seven ball-bearings, 10 mm in diameter, embedded in a horseshoe shaped base at varying depths. The coordinates of the SSM were measured using a coordinate measuring machine (CMM) with an accuracy of 2 microns (Mitutoyo Crysta Apex-C CMM 544/ Mitutoyo, Japan) . The SSM was then scanned 3 times using a contact stylus profilometer scanner (incise™/ Renishaw, UK) and a non-contact class II laser scanner (FARO™ V3/ FARO, USA) and stereolithography (STL) images were generated. A surface-matching software (Verisurf™ / Verisurf, USA) was used to compare the scan-generated STL images to the CMM measured coordinates of the SSM's seven ball-bearings. Result: The 3D contact scanner measurements demonstrated a higher accuracy and precision compared to the non-contact scanner. Mean measurements’ difference between the incise™ and CMM was 2.8 microns with a standard error of 0.2 microns, while the FARO™ demonstrated a mean difference of 82 microns with a standard error of 7.5 microns. However, the incise™ scanning time was twice that for the FARO™.Conclusion: The novel testing method can be employed to independently calibrate and validate the accuracy and precision of contact and non-contact 3D scanners with the potential use in tooth wear quantification studies that require high accuracy and precision measurements. 3D contact scanners offer more accurate and precise measurements compared to non-contact scanners. On the other hand, contact scanners can be more time-consuming.",
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Ahmed, KE, Ju, X, Whitters, CJ, Pierce, S & MacLeod, CN 2013, 'Calibratation of 3D Scanners for Quantification of Tooth Wear' Paper presented at 46th meeting of the Continental European Division of the International Association for Dental Research organized together with NOF , Florence, Italy, 4/09/13 - 7/09/13, .

Calibratation of 3D Scanners for Quantification of Tooth Wear. / Ahmed, K.E. ; Ju, X; Whitters, C.J; Pierce, Stephen; MacLeod, Charles Norman.

2013. Paper presented at 46th meeting of the Continental European Division of the International Association for Dental Research organized together with NOF , Florence, Italy.

Research output: Contribution to conferencePaper

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T1 - Calibratation of 3D Scanners for Quantification of Tooth Wear

AU - Ahmed, K.E.

AU - Ju, X

AU - Whitters, C.J

AU - Pierce, Stephen

AU - MacLeod, Charles Norman

PY - 2013/9

Y1 - 2013/9

N2 - Objective: To establish a novel testing method capable of calibration and validation of contact and non-contact 3D scanners for accurate quantification of tooth wear in patients.Method: A stainless steel model (SSM) was fabricated to consist of seven ball-bearings, 10 mm in diameter, embedded in a horseshoe shaped base at varying depths. The coordinates of the SSM were measured using a coordinate measuring machine (CMM) with an accuracy of 2 microns (Mitutoyo Crysta Apex-C CMM 544/ Mitutoyo, Japan) . The SSM was then scanned 3 times using a contact stylus profilometer scanner (incise™/ Renishaw, UK) and a non-contact class II laser scanner (FARO™ V3/ FARO, USA) and stereolithography (STL) images were generated. A surface-matching software (Verisurf™ / Verisurf, USA) was used to compare the scan-generated STL images to the CMM measured coordinates of the SSM's seven ball-bearings. Result: The 3D contact scanner measurements demonstrated a higher accuracy and precision compared to the non-contact scanner. Mean measurements’ difference between the incise™ and CMM was 2.8 microns with a standard error of 0.2 microns, while the FARO™ demonstrated a mean difference of 82 microns with a standard error of 7.5 microns. However, the incise™ scanning time was twice that for the FARO™.Conclusion: The novel testing method can be employed to independently calibrate and validate the accuracy and precision of contact and non-contact 3D scanners with the potential use in tooth wear quantification studies that require high accuracy and precision measurements. 3D contact scanners offer more accurate and precise measurements compared to non-contact scanners. On the other hand, contact scanners can be more time-consuming.

AB - Objective: To establish a novel testing method capable of calibration and validation of contact and non-contact 3D scanners for accurate quantification of tooth wear in patients.Method: A stainless steel model (SSM) was fabricated to consist of seven ball-bearings, 10 mm in diameter, embedded in a horseshoe shaped base at varying depths. The coordinates of the SSM were measured using a coordinate measuring machine (CMM) with an accuracy of 2 microns (Mitutoyo Crysta Apex-C CMM 544/ Mitutoyo, Japan) . The SSM was then scanned 3 times using a contact stylus profilometer scanner (incise™/ Renishaw, UK) and a non-contact class II laser scanner (FARO™ V3/ FARO, USA) and stereolithography (STL) images were generated. A surface-matching software (Verisurf™ / Verisurf, USA) was used to compare the scan-generated STL images to the CMM measured coordinates of the SSM's seven ball-bearings. Result: The 3D contact scanner measurements demonstrated a higher accuracy and precision compared to the non-contact scanner. Mean measurements’ difference between the incise™ and CMM was 2.8 microns with a standard error of 0.2 microns, while the FARO™ demonstrated a mean difference of 82 microns with a standard error of 7.5 microns. However, the incise™ scanning time was twice that for the FARO™.Conclusion: The novel testing method can be employed to independently calibrate and validate the accuracy and precision of contact and non-contact 3D scanners with the potential use in tooth wear quantification studies that require high accuracy and precision measurements. 3D contact scanners offer more accurate and precise measurements compared to non-contact scanners. On the other hand, contact scanners can be more time-consuming.

KW - calibration

KW - 3D scanners

KW - quantification

KW - tooth wear

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Ahmed KE, Ju X, Whitters CJ, Pierce S, MacLeod CN. Calibratation of 3D Scanners for Quantification of Tooth Wear. 2013. Paper presented at 46th meeting of the Continental European Division of the International Association for Dental Research organized together with NOF , Florence, Italy.